Abstract: The current ground meteorological observation situation teaching system in use in the training cannot provide real-time weather phenomenon situation, real-time observation data anomaly one and real-time observation equipment failure one for meteorological observation practical training, so cannot simultaneously carry out practical training teaching based on historical observation situation and real-time observation one. In view of the above problem, the virtual serial port technology and the data sharing method of LAN are used to develop the ground meteorological observation data real-time distribution system in the VC6.0 program development environment in this paper. In this system, the program development idea of the object-oriented idea combining with process-oriented one, the multithreaded method and the serial port communication mechanism are used. For the first time, the system realizes minutes of real-time observation data and status one, and hours of statistics data real-time distributing and sharing from teacher computer to student ones in LAN, so that the function of carrying out practical training based on historical observation situation and real-time observation one comes true. The test and application shows that the system is reasonable in design, convenient in operation, timely and stably in data distribution and sharing, which meets the requirements of multiple students participate in the ground meteorological observation situational teaching simultaneously, and greatly improves the actual effect of ground meteorological observation training. The research results can provide technical reference for the design and development of real-time situational teaching system.